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Thread: RD scan rate

  1. #1
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    Default RD scan rate

    How fast can a radar detector scan in terms of GHz/sec?

    Also do radar detectors have seperate receive units for each band or is it one extremely wideband receiver?

    And how does the STI's multi oscillator and multi horn system work?

  2. #2
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    well, on my 955 it says that it alerts to radar in about .432 secs, most of the time and for laser about .123 if you even get a laser alert because most of the time its to late. as for multiple reciving units i belive it has one and recongnizes the band by the frequency. as for the sti, ask jim

  3. #3
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    Default Re: RD scan rate

    Quote Originally Posted by ltilaser
    How fast can a radar detector scan in terms of GHz/sec?

    Also do radar detectors have seperate receive units for each band or is it one extremely wideband receiver?

    And how does the STI's multi oscillator and multi horn system work?
    http://www.radarbusters.com/support/...y-response.asp

  4. #4
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    Jimbonzzz has already called this "Immediacy of Response" test flawed because they used a stopwatch for the testing which allows for human error. If you want to do precise testing, you have to film it so that you can look at it frame by frame to see which one has a quicker response.

    There are plenty of videos showing the V1 alerting quicker than every radar detector and sometimes the other detectors didn't alert at all to quick pulls of the radar gun's trigger so the V1 probably has the quickest response time.

  5. #5
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    Default Re: RD scan rate

    Quote Originally Posted by ltilaser
    How fast can a radar detector scan in terms of GHz/sec?
    Most detectors can sweep all bands in 100-300ms.
    But, there are "delays" built into the software to reduce false alerts, where a signal must be present for a certain amount of time, or for a certain number of sweeps, in order to be reported.

    Quote Originally Posted by ltilaser
    Also do radar detectors have seperate receive units for each band or is it one extremely wideband receiver?
    Most detectors currently on the market use the same horn antenna and oscillators to receive all bands, with the exception of the STi.

    Quote Originally Posted by ltilaser
    And how does the STI's multi oscillator and multi horn system work?
    The STi receives X band in one horn, and K/Ka in the other. There are separate oscillators for X, K, and Ka, so it has three first LOs. The detector switches between the K and Ka oscillators since both pass into the same mixer. The rest is probably similar to current units.

  6. #6
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    Quote Originally Posted by <<JAZZY>>
    There are plenty of videos showing the V1 alerting quicker than every radar detector and sometimes the other detectors didn't alert at all to quick pulls of the radar gun's trigger so the V1 probably has the quickest response time.
    In all odds what that probably is; is just a lack of "delay" such as Jim explains in his post... which makes it one of the faster detectors in 'response times', but the trade off could be why (among other reasons) it is considered to be one of the most false prone detectors in the world, scanning time (how long it actually takes to complete) is probably near identical on the Belscort units to the V1 (extremely short).

  7. #7
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    Now jim,

    You say the STI has 2 frontal horns - 1 for k/ka and 1 for x.

    Now ALL other detectors have 1 frontal horn.

    So if you turn off the X band on the RD, hypothetically shouldn't you have the same response time as the sti? or close to?

  8. #8
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    Quote Originally Posted by bauzer71487
    Now jim,

    You say the STI has 2 frontal horns - 1 for k/ka and 1 for x.

    Now ALL other detectors have 1 frontal horn.

    So if you turn off the X band on the RD, hypothetically shouldn't you have the same response time as the sti? or close to?
    Different detectors use different sweep schemes/times, so it would be difficult to say. The differences in sweep times between detector models would probably be greater than any sweep time benefit from turning off X-Band.

  9. #9
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    hey jim, do you think the dual antennas on the STi help it pick-up Ka faster than other rd's (it did extremly well when you guys tested it last in jan.) did bell developed the design for performance reasons?

  10. #10
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    Quote Originally Posted by WRC
    hey jim, do you think the dual antennas on the STi help it pick-up Ka faster than other rd's (it did extremly well when you guys tested it last in jan.) did bell developed the design for performance reasons?
    Obviously not being Jim, this is my thinking about this (to try and awnser this for you)...

    It could be the STi was built (by Bel) with dual antennas for performance in mind (better reception on all bands), but the thing is, eliminating X-band from a sweep really wouldnt do all that much. I say this because X band is so narrow that the amount (of time) the RD takes to scan X compared to scanning the Ka frequencies is diminutive.

    In other words: Putting (X-band)it on its own seperate antenna (at least for performance gains as far as range/sensativity), doesn't make a boat-load of sense, because it is such a small fraction of the total scanning time compared to Ka.

    So I would surmise that it actually has something to do with something rather then pure performance/range, maybe has to do with keeping it 'undetectable' or another performance issue, but as far as pure range gained from keeping X by itself should be miniscule.


    Again Jim or someone with a bit more technical know-how in this field will elaborate and have the correct awnser I am sure.

 

 

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